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US 4,307,836 AGranted
Pneumatic control means for a vehicle heat exchanger system or the like
AssigneeRobertshaw Controls Company
InventorDouglas R. Scott
Life of this patent
Estimating the term…
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AssigneeRobertshaw Controls Company
InventorDouglas R. Scott
Estimating the term…
A thermostat construction having a valve unit for directing a pneumatic signal to a pneumatically operated control device in relation to the force differential between the temperature sensed by the temperature sensing unit thereof and the temperature setting of a temperature setting unit thereof, a lever being pivotally mounted to the construction and being operatively interconnected to the valve unit at a first portion of the lever and to the temperature setting unit and the temperature sensing unit at a second portion of the lever. A pneumatically operated positioning construction having a valve unit for directing a pneumatic signal to a positioning chamber thereof in relation to the force differential between a pneumatically operated setting unit thereof and a feedback unit of the positioning chamber, a lever being pivotally mounted to the construction and being operatively interconnected to the valve unit at a first portion of the lever and to the setting unit and the feedback unit at a second portion of the lever.
In a pneumatically operated positioning construction having valve means for directing a pneumatic signal to a positioning chamber thereof in relation to the force differential between a pneumatically operated setting means thereof and a feedback means of said positioning chamber, the improvement comprising a lever having a pivot means thereof pivotally mounted to said construction, said lever being operatively interconnected to said valve means at a first portion means of said lever and to said setting means and said feedback means at a second portion means of said lever.
In a method of making a pneumatically operated positioning construction having valve means for directing a pneumatic signal to a positioning chamber thereof in relation to the force differential between a pneumatically operated setting means thereof and a feedback means of said positioning chamber, the improvement comprising the steps of pivoting a lever by the pivot means thereof to said construction, and operatively interconnecting said lever to said valve means at a first portion means of said lever and to said setting means and said feedback means at a second portion means of said lever.
Dependencies are inferred from the claim text.